JP2000023265A - Connector for digital cordless telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the connector whose connection number to the digital cordless telephone system is increased through the adoption of a distribution processing system. SOLUTION: The digital cordless telephone system is provided with plurality of connectors connecting to an extension bus from a master set such as a home telephone set and plurality of slave sets connecting to the connectors through radio channels adopting the TDMA/TDD system. In this case, each connector for the digital cordless telephone system is provided with a means that generates a reference clock and a reference timing from outgoing bus data from the master set through the extension buses and with a means that individually sets a time width from a reference point of time of the reference timing till its own transmission reception slot so that slots used by the respective connectors are not timely overlapped. Furthermore, in the case that the connectors whose number is more than number of transmission reception slots connect to the master set above, carrier sense is conducted and different transmission frequencies are used as required.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of connection devices connected to an extension bus from a main unit of a home telephone or a key telephone device, and to the connection devices and TDMA / TDD.
The present invention relates to a connection device in a digital cordless telephone device provided with a plurality of slave units connected by a wireless line using a system (time division multiple access time division two-way communication system).

[0002]

2. Description of the Related Art Conventionally, in a digital cordless telephone apparatus, when a plurality of slave units are used at the same time, the following two systems have been used. By controlling the frequency and controlling the transmission / reception slot by the control unit of the main device, centralized control is performed so as not to cause interference in the wireless transmission path of each connection device. Alternatively, there is a method in which transmission / reception slots are asynchronously distributed between connected devices.

[0003]

However, in the former method of centralized control, the burden on the control unit of the main unit is large, and complicated control means is required. Also, in the latter conventional distributed processing method, radio interference between connected devices occurs. Therefore, the number of accommodated digital cordless telephone devices is limited in consideration of the transmission / reception characteristics of the radio unit with respect to the radio interference, and the number of accommodated digital cordless telephone devices is about three. Could only be accommodated. An object of the present invention is to provide a connection device capable of increasing the number of connection devices in one digital cordless telephone device by a distributed processing method in which the above-mentioned problem is solved.

[0004]

The present invention has the following arrangement to achieve the above object. (1) A plurality of connecting devices connected to an extension bus from a main device of a home telephone or a key telephone device, and a plurality of slave units connected to these connecting devices via a wireless line using a TDMA / TDD system. In a digital cordless telephone device, means for generating a reference clock and a reference timing from downlink bus data transmitted from the main unit through the extension bus, and a time period from the reference time of the reference timing to its own transmission / reception slot. Means for individually setting the width, so that the slots used by the individual connection devices do not overlap. (2) In the case where the number of connecting devices equal to or more than the number of slots is connected to the main device, the connecting devices using the overlapped slots perform carrier sense and use different transmission frequencies. Connection device.

[0005]

FIG. 1 is a diagram showing a TDMA / TDD frame constituted by transmission / reception slots according to an embodiment of the present invention. FIG. 2A is a diagram showing (N) basic frames arriving from a reception line of an extension bus. FIG. 2 is a diagram showing a composed multiframe, FIG.
FIG. 2B is a diagram for extracting a multi-frame clock MFCK from a multi-frame, and FIG. 2C is a diagram for extracting a basic frame signal from a multi-frame. FIG. 3 is a configuration diagram of a home telephone using a digital cordless telephone device. FIG. 4 is a block diagram of the connection device. 1
Is a main device, 2 is a connection device (CS1 to L), 3 is an antenna, and 4 is a slave (PS). 10 is a telephone exchange, 1
1 is an ISDN line or a telephone line, 12 is an extension bus, 14
Is a telephone connected to the extension bus, and 20 is a digital cordless telephone comprising a part of the main device 1, the connecting device 2 and the subunit 4 group. 21 is an extension bus connector, 2
3 is a bus data transmission / reception unit, 24 is a phase corrector, 25 is a baseband LSI, 26 is an ADPCM-CODEC in the baseband LSI 25, 27 is a TDMA / TDD processing unit, 28 is a π / 4 QPSK modem, 29 is a radio unit, 30
Is a bus, 31 is a CPU, 32 is a reference clock generator, 3
Reference numeral 3 denotes a reference timing generator, 34 denotes a construction switch for setting the number of the connection device 2, 35 denotes a memory, 36 denotes an ID-ROM that stores the CS-ID of the connection device 2, and 37 denotes a power supply. The TDMA / TDD frame shown in FIG.
It is composed of 4 slots for transmission and 4 slots for reception, so that the connection device 2 and the slave unit 4 can use the same carrier wave and simultaneously make four conversations.

First, the configuration of a home telephone will be described with reference to FIG. The main unit 1 is an IS from the central office 10
A DN line (or telephone line, the same applies hereinafter) is accommodated.
The connection device 2 and the telephone set 14 are connected to the main device 1 through an extension bus 12. Under the control of the main unit 1, the slave unit 4 is connected to the ISD through the connection unit 2 connected via a wireless line.
It makes outgoing calls to N lines and receives incoming calls from ISDN lines. A portion of the connection device 2, the slave 4, and the main device 1, such as control of a wireless line, that is, a portion excluding control of a telephone or the like is defined as a digital cordless telephone device 20.

Next, the operation of the connection device 2 of the present invention shown in FIGS. 3 and 4 will be described using various signals shown in FIGS. Various signals are transmitted from the main device 1 to the connection device 2 through the extension bus 12. These signals are configured in a multi-frame format as shown in FIG. The multiframe is composed of N basic frames at the beginning, which are composed of frame number data, B channel data corresponding to each connection device, D channel data for control, and the like. The multi-frame signal of FIG. 2A supplied from the main device 1 to each connection device 2 via the extension bus 12 reaches the bus data transmission / reception unit 23 through the bus connector 21. The bus data transmission / reception unit 23 converts the input multi-frame signal
The multi-frame clock shown in (2) is generated and output to the reference timing generator 33. Also, it generates an 8 kHz basic frame signal shown in FIG. 2C and outputs it to the reference clock generator 32 and the phase corrector 24.

The reference clock generator 32 is a PLL circuit, and is configured to adjust the 8 kHz used as the PCM synchronization signal between the baseband LSI 25 and the phase corrector 24 to the basic frame signal 8 kHz from the bus data transmitter / receiver 23. The oscillation of the clock 19.2 MHz is controlled. In the baseband LSI 25, this reference clock 19.2
After receiving the supply of MHz, the frequency is divided to 8 kHz and returned to the reference clock generator 32. Reference timing generator 3
In 3, the frequency of the reference clock 19.2 MHz input from the reference clock generator 32 is divided and the TDMA / TDD processor 2
The transmission / reception slot timing of 625 μS, which is the synchronization signal shown in FIG.
5ms TDMA / TDD frame timing by CPU
31.

Control data on a multi-frame from the extension bus 12 (indicated by D (N-1) in FIG.
Output to the bus 30 toward U31. The CPU 31 performs various controls based on the received control data and also controls transmission of control data transmitted from the own connection device 2 to the main device 1. Also, the Bch data (voice data or data communication data) in the multi-frame is sent from the bus data transmitting / receiving unit 23 to the phase corrector 24 in synchronization with the reference frame timing 8 kHz. In addition, one connection device 2 takes in, for example, B0 assigned to itself from the Bch of the multi-frame of FIG. 2A. In the phase corrector 24, the reference timing (PCM synchronization signal) of the baseband LSI 25 supplied from the baseband LSI 25 is used.
Replace with 8kHz (synchronized) baseband LS
It is sent to ADPCM-CODEC 26 in I25. Further, the TDMA / TDD processing unit 27
Each of the 32 kbps data from the CM CODEC 26 is converted into a 384 kbps burst signal, and is assigned to one of the transmission slots indicated by CS1 in FIG. / 4 QPSK modem 28. π
The / 4QPSK modem 28 modulates the input signal and sends it to the radio unit 29. The radio unit 29 converts this signal into a transmission frequency and emits it from the antenna 3 as a radio wave.

On the other hand, the radio unit 29, which has received the radio wave emitted from the slave unit through the antenna of the connection device 20, converts the frequency and then outputs the π / 4 QPS in the baseband LSI 25.
Send it to the K modem 28. The signal demodulated by the π / 4 QPSK modem 28 is arranged at a reception slot position corresponding to a transmission slot position as shown in FIG. TDMA
In the / TDD processing section 27, 384 kb
The speed is converted from ps to 32 kbps, the received data at the unique receiving slot position is detected, and the ADPCM-C
The ODEC 26 converts the data into 64 kbps data and sends the converted data to the phase corrector 24. Phase corrector 2
In step 4, the data received from the baseband LSI 25 is transmitted to the bus data transmitting / receiving unit 23 with the PCM synchronization signal (basic frame signal) of the bus data transmitting / receiving unit 23 at the timing of 8 KHz. The CPU 31 inserts the received data from the phase corrector 24 into the Bch position corresponding to its own connection device, inserts the control data from the CPU 31 into the Dch, and synchronizes it with the received multi-frame shown in FIG. The transmission multi-frame (not shown) is created and transmitted to (the transmission line of) the extension bus 12. As described above, in the digital cordless telephone device 20, each connection device 2 performs transmission / reception with the handset 4 connected by a wireless line.

However, when a new home telephone is installed or a power failure is restored, simply by supplying power to each device, the transmission / reception slots between the connected devices are synchronized as in the case of the conventional distributed processing type connection device. Therefore, control to avoid radio wave interference between connected devices cannot be performed.

Therefore, in the present invention, the first step is as follows. The frame number F0 in FIG.
For example, data for activating the slot synchronization between the connected devices is inserted into the reception timing RT in the basic frame once every 30 seconds. CP of all connection devices 2
U31 is a reception timing R as data relating to control input from the extension bus through the bus data transmission / reception unit 23.
When the data of T is detected, it instructs the TDMA / TDD processing unit 27 in the baseband LSI 25 through the bus 30 to enter a standby state for a frame signal coming from the extension bus 12. Next, the reception timing RT
A multi-frame clock MFCK that responds at the beginning of B0, which is the Bch data following the frame number “F0”, which is the head of the next multiframe following the multiframe in which the data was inserted, is connected to the bus. The data is transmitted from the data transmission / reception unit 23 to the reference timing generation unit 33. When reset by the multi-frame clock MFCK, the reference timing generator 33 newly starts outputting the 625 ms transmission / reception slot timing and the 5 ms TDMA / TDD frame timing shown in FIG. The baseband LSI 25 starts counting the input 625 μS signal (pulse) by a counter (not shown). 5 ms input by CPU 31
Each time a signal (pulse) is input, the baseband LSI 2
5 is sent to the counter reset signal. Then, when the counter of the baseband LSI 25 receives the signal of 625 μS eight times, it is cleared by the reset signal of 5 ms from the CPU 31. Then, this operation is repeated. The TDMA / TDD processing unit 27 synchronizes transmission / reception slots based on the reference timing shown in FIG.
In other words, 5m composed of four transmission slots and four reception slots of 625 μS by this synchronization timing
An S TDMA / TDD frame is generated. Since all the connecting devices perform the same operation as above at the same timing,
Each connecting device is in a synchronized state as shown in FIG.

The second step of the present invention is as follows.
In the present embodiment, each of the connection devices 2
It has the function of sending and receiving individual pieces. The time for one transmission / reception slot is 625 μS. As shown in FIG. 1, the connection device 2 (CS1) extracts the above-mentioned multi-frame clock MFCK extracted from the downlink (reception) extension bus data.
The transmission slot is arranged at the same time as the reference time of the reference timing, and the next connection device 2 (CS2) arranges the transmission slot 625 μS later than the reference time of the reference timing, and the next connection device 2 (CS3) The transmission slot is arranged 625 μS × 2 later than the reference time of the reference timing, and the connection device 2 (CS4) arranges the transmission slot later than the reference time of the reference timing by 625 μS × 3.

The setting for the connection device is performed by setting a different number in the CPU 31 for each connection device.
Set by 4. CPU 31 is a baseband LSI 2
No. 5 TDMA / TDD processing unit 27 is controlled to operate with a delay time corresponding to the set number of the connection device.
As described above, each connection device that uses one transmission / reception slot ensures that the timing of the transmission / reception slot does not overlap with that of another connection device. Also TDMA / TDD
Since the frame consists of 4 slots for each transmission and reception,
When five or more connection devices 2 are connected to the main device 1 and used, the same delay time as the first four devices divided into different slots is set. However, since there are a plurality of transmit / receive carrier frequencies that can be used, the wireless unit 29 detects whether or not another connection device is emitting a radio wave (carrier sense).
When a radio wave of another connection device is detected, transmission / reception can be performed after changing the use frequency.

In the above embodiment, the control timing and the communication timing are not separately described, but the operation is the same except that the control timing is a superframe interval.

[0016]

The connection device of the digital cordless telephone device of the present invention is of a distributed processing type. However, even if a plurality of connection devices are connected such that each connection device uses an individual transmission / reception slot, radio interference can be prevented. Since the connection device is eliminated, the number of connection devices connected to the main device can be increased.

[Brief description of the drawings]

FIG. 1 is a diagram showing a transmission / reception slot according to an embodiment of the invention;

FIG. 2 is a diagram showing (1) a multi-frame coming from a reception line of an extension bus; (2) a diagram extracting a multi-frame clock from the multi-frame; and (3) a diagram extracting a basic frame signal from the multi-frame.

FIG. 3 is a configuration diagram of a home telephone using a digital cordless telephone device.

FIG. 4 is a block diagram of a connection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main apparatus 2 Connection apparatus (CS1-L) 3 Antenna 4 Remote unit (PS) 10 Central office exchange 11 ISDN line 12 Extension bus 14 Telephone 20 Digital cordless telephone apparatus 21 Extension bus connector 23 Bus data transmission / reception part 24 Phase corrector 25 Baseband LSI 26 ADPCM-CODEC 27 TDMA / TDD processing unit 28 π / 4 QPSK modem 29 Radio unit 30 Bus 31 CPU 32 Reference clock generation unit 33 Reference timing generation unit 34 Construction switch 35 Memory 36 ID-ROM 37 Power supply

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Takashi Matsumoto Inventor F-term (reference) in Nippon Telegraph and Telephone Corporation 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo 5K027 AA03 AA08 BB03 CC08 GG08 JJ03 KK04 5K049 AA12 BB07 BB16 BB24 DD04 DD05 FF02 FF43 5K067 AA03 AA22 BB04 BB08 CC04 DD11 DD25 EE02 EE10 EE16 EE23 EE59 EE67 EE72 GG03 GG04

Claims (2)

[Claims] 1. A plurality of connecting devices connected to an extension bus from a main device of a home telephone or a key telephone device, and a plurality of slave units connected to these connecting devices via a radio line using a TDMA / TDD system. A digital cordless telephone device comprising: a means for generating a reference clock and a reference timing from downlink bus data transmitted from the main unit through the extension bus; and Means for individually setting the time width of the digital cordless telephone device, wherein the slots used by the individual connection devices are prevented from overlapping. 2. When two or more connection devices are connected to the main unit, the connection devices using the overlapped transmission / reception slots perform carrier sense and use different transmission frequencies. A connection device for a digital cordless telephone device according to claim 1.